Which gunslinger set fares the best in FSC? Vana fight included.
(No trinket slots available)
Nameless:
Defense against shadowfire and mask bullets, and elemental damage components in general
VH Gun ASI, may help with Blitz Needle Recovery
Deadshot:
Undead boost VH, and most of FSC is undead
Defends against all shadow components in FSC, which is most all of the monsters in the place
ASI Med, may help with Blitz Needle Recovery
Shadowsun:
General Damage boost VH, Helps all guns against all monster types
Defends against all shadow components in FSC, which is most all of the monsters in the place
I guess its the argument of Damage V Attack Speed Increase all over again.
Overall, Shadowsun.
Prior to the bomb/gun buff patch, you would need at least a VH Damage bonus to be able to 1 charge kill a Trojan with the Blitz Needle. This is very important, as being able to keep a trojan out of commission before they can even bother anyone is great, especially if there's a chance he could charge someone into shadowfire/flames/spikes ect. It also buffs damage against Vana (including his mask) which usually will be the hardest part of FSC for most people in general.
You could also try a Hybrid setup with Deadshot and Shadowsun along with (I know you said no trinkets, but just food for thought) 1 asi trinket + 1 damage trinket & swiftstrike. This gives Max ASI, Max vs Undead and VH to those trojans (though I believe you can manage to 1 charge kill them with just a Med bonus because of the patch.) as well as Vana. ASI does, in fact speed up the recovery of the Blitz's charge attack (though not the attack itself). Can be very helpful, since getting stunned while recovering or during the charge attack will cause you to freeze in place for an excruciatingly long amount of time.
Also keep in mind that the Deadshot damage buff is too all weapons, not just guns. So hybrid sword/gun bomb/gun loadouts benefit greatly from the set.
This is coming from a person who used the deadshot religiously prior to the shadowsun patch.